Merged changes from Trunk:

* Updated tests to check for cyclic dependencies.
* Added <cmath> header.
* Fixed some bugs involving the new MSVC native TR1 library.
* Fixed some cyclic dependency bugs.

[SVN r49214]

libs/tr1

@@ -1 +1 @@
-Subproject commit bc3d314a80d7825ba4ab10f2e878ccd8413527cf
+Subproject commit c28a0e9a4ec86441296cca28e7722aa6127ae3c3